Improvement in head-blocks of saw-mills



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Letters Patent No. 95,904, dated October 19, 1869 IMPROVEMENT INHEAD-BLOCKS OF SAW-MILLS.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom tt ymay concernv Be it known that I, J osnPH HUBBELL, ofZanesville, in the county of Muskingum, and State of Ohio,

' have invented certain new and useful Improvements in Head-Blocks forSaw-Mills, of which the following is a full, clear, and exactdescription. i

It is the object of my invention to so construct the mechanism foroperating bead-blocks for saw-mills7 that the material to be sawed shallbe moved `with certainty and rapidity the distance desired, and so thatthe jacks for moving the material may quickly be disengaged from theirpropelling-mechanism' to admit of their movements being reversed; and

The improvements herein claimed consist,

First, in the combination of a pitman, a vibrating. lever for operatingthe pitmau, and impartinwthereto a reciprocating movement in its guides,pawls, or spring-clutches, operated by means of the pitman throughlink-comieetions, a ratchet-wheel, with which the pawls engage,a pinion,a worm-shaft, and a feeding-jack, the clutches being so arrangedinpairs, and connected with and operated bythe pitman, as to impart acontinuous movement to' the ratchet-wheel, when desired, by thevibrations of the lever, as hereinafter set forth.

Second, in the combination, with the ratchet-Wheel, of the spring-parvisor ratchet, constructed as hereinafter set forth.

Third, in the combination of the spring-parvis or ratchet-clutches, anda retractor, having an inclined bearing-surface to retract the clutches,by pressing` upon their feet or short projections,as hereinafter setforth.

Fourth,in the combination of a double pitman or reciprocating bar,pawls, or spring-clutches, linked to this bar, cogged wheels, withinterval ratchet-teeth, screw-shafts secured in the head-blocks, andcarrying pinions corresponding with the oog-wheels, lscrew'- sockets, ornuts, and feeding jacks, to which the sockets or n'uts are'att-ached, ashereinafter set forth.

In the accompanying drawing- Figure 1 represents a plan or top view of acarriage, having my improvements applied thereto;

Figure 2, a view, in elevation, of the' carriage, as seen from the rear;

Figure 3, a vertical transverse section through the same, at the line :cx of iig. l; and

Figure 4, a sectional view, on an enlarged scale, at the line y y offig. l, showing the pawl-retracting devices..

A represents the timbers composing an ordinary carriage, traversed inany well-known and suitable way.

Upon this carriage are secured, in a suitable 'manner, two slotted orrecessed blocks or frames B In each block is secured a feeding-jack orknee, C C', so as to slide endwise, but be prevented from movingvertically, as shown fully in tig. 2.

Upon the under side or each knee orjack is firmly fastened a threadedsocket or screw-nut, D, through each of which is passed a screw orworm-shaft, E E,

secured in suitable bearings in the blocks B B', and

each having secured upon its outer' end a crankwheclF F', the latterbeing shown in dotted lines in iig. 2.

'By turning the crank-wheels F F-, the feeding-jacks may be propelledeither toward or from the operator.

A small spur-pinion, GG, is fastened to each shaft E E, near its outerbearing e c.

Two large spur driving-wheels H H' (a portion of the outer `side of thelatter being shown, as broken away, in fig. 2) have their shafts securedin bearings in bracket-s II I I', fastened to the head-blocks.

These driving-wheels have ratchet-teeth on their outer faces, as shownin fig, 2.

An annular slightly-projecting ridge or rim, fi, is, in this instance,formed upon each wheel, of `less diameter than the wheel, and theratchet-teeth' made upon separate rims to fit upon the ridges t', insuch manner as to bring the peripheries of the ratchet-rims flush, whenin'place upon the wheel, with the teeth upon the oog-wheels, and allowthe ratchet-rims to project outward, sidewise, from the wheels. But theratchetteethmay be cast with the wheels'if desired.

Upon theishaft of each driving-wheel is a loose collar or sleeve, jj,carrying or being cast with pawlholders or guides J J J" J', each formedof a main4 piece, with two studs orshort arms, It t, projecting from itucar the top and bottom.

vThese arms have holes in them, to form guides' for the pawls lll, whichare protruded, and causedto engage the ra'tohets, by springs bearingagainst pins upon the pawls, and upon the lower' arms or studs of theguides or holders.

Each pawl has a short projection or foot, Il, upon its lower end, asshown in figs.' l and 4.

The pawls or clutches are disengaged or retracted by a reti-actor, lr,on each wheel-shaft. (See tig. 4.)

Ihe retractors may be caused to slide upon. their shafts, by thepush-rods L sliding through the outer brackets I I', and attached to theretractors k.

The inclined inner sides of the retracting-slides K draw down the pawlsl1, by sliding upon the feet l).

A recess on one side of each opening in the brackets for the push-rods,admits of a pin on each -rod-sleeve Il passing through thc opening, andafter the'pins have passed, with the rods and their casings or sleeves,through these openings, by turning the sleeves, the pins prevent'therods from retracting, and lock down the pawls.

'lo each pawl-holder or guide is pivoted one end of a link, M, the otherends of these links being pinjointed to a bracket or adjustable shortstandard, N, secured upon a rod, O.

A lever, l), is fulerumed on an arm or support, 1), projecting from theframing A.

rlhe upper end of the lever moves ina guide, Q, also secured by itssupport to the framing.

The movements of the lever may be regulated by stop-pins in the guide.

rlhe lever is forked, and its arms pass, one on each side of the bar O,to which the lever is connected by a link, R, and short standard oradjustable bracket S.

The bar O passes through holes in a guide-plate, T, beneathv eachhead-block, (one being shown in fig. 3,) and is reciprocated in itsguides by the vibrations ofthe level' P, the forked end of which alsoserves as a guide and brace for the central part of this reciprocatingbar or pitman O.

The-operation is as follows:

The pawls being in contact with the ratchets of the driving-wheels, amovement of the lever in either direction slides the pitman O, andcauses one pawl or clutch of each wheel to act and the other to slideover the teeth of the ratchets, and upon the reverse movement of thelever, the action of the pawls is changedf The two that before slippedover the teeth, now engage them to rotate the wheels, and the othersslip.

A continuous rotation is thus imparted to the Wheels.

while the lever is vibrate-d.

rlhe driving-wheels mesh with and rotate the pinions G G, which revolvethe shafts E E, and these move the nuts D, and consequently, the feedingjacks. Either wheel may be disengaged from the pawls alone, so as tomove one end of the material to be sawed more than the other.

The jacks likewise may be moved, by revolving the wheels F F', by thecrank-pins f f.

When the jacks are 'to be moved back, the sliding reti-actors k areshoved in upon the feet lz, of the pawls, either by the push-rods orother suitable shipping devices, which are thus disengaged from theratchet-teeth ofthe driving-wheels. The crank-wheels are then revolvedto the right until the jacks have been moved the desired distance.

That I'claim as myinvention, and desire to secure by Letters Patent, is-

l. The combination of the vibrating hand-lever, the reciprocatingpitman, the spring-clutches linked to and operated by the pitman, theratchet-teeth on the driving-wheels, the pinion, theworm-shaft, and thejacks, al1 these parts being constructed Yas set forth.

2. The combination of the driving-wheels, the reciprocating pawls movingparallel to the face of the wheels, the springs, and the vibratingpawl-holders, all constructed as set forth.

3. The combination of the pawl-holders, the springpawls, each having ashort projection or foot, F, and the retractor k, all constructed as setforth.

4. The combination of tbe reciprocating sliding bar, pawis, orspring-clutches, connected by links with the bar, cogged driving-wheels,having internal ratchetteeth, screw or worm-shafts, secured in theheadblocks, and carrying pinions corresponding with and driven by theeogged wheels, screw-sockets or nuts, in which the shafts turn, andfeeding-jacks, slidingin the head-blocks, and to which the sockets ornuts are secured, the combination being and operating substantially asset forth.

In testimony whereof, I have hereunto subscribed my name.

JGSEPH HUBBELL.

'itnesses:

J CHN GILBERT, J. GLnssNnR.

